| ⇢ | A | ProblemSample added | |
| ⇢ | A | Pastebin added | |
| A | ↛ | PastebinModel removed | 
| ⇢ | B | Pastebin::generate() added | |
| ⇢ | A | Problem::problemSamples() added | |
| ⇢ | A | ProblemSample::problem() added | |
| ⇢ | A | Pastebin::user() added | |
| ⇢ | A | Pastebin::generatePbCode() added | |
| C | ↘ | F | ProblemController::form() got worse | 
| B | ↛ | PastebinModel::generate() removed | |
| A | ↛ | PastebinModel::generatePbCode() removed | |
| A | ↛ | PastebinModel::detail() removed |